JPH1114132A - Damper with air volume adjustment mechanism for duct - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a damper capable of adjusting an air volume without generating wind noise. According to the present invention, a stainless steel sheet (34, 36) elastically deformed into a streamline shape is disposed on a wall surface of a duct, and the stainless steel sheet (34, 36) is elastically deformed in a direction perpendicular to the direction of an air flow to generate wind. It has an adjustment unit 16 for adjusting the road area. As the stainless sheets 34 and 36 are elastically deformed by the adjustment unit 16 to reduce the area of the air passage, the stainless sheets 34 and 36 are elastically deformed in a streamlined shape, and the air flow is formed on the curved surfaces of the stainless sheets 34 and 36. Pass the windway without disturbing along. Therefore, no wind noise is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper having a duct air volume adjusting mechanism, and more particularly to a damper having a duct air volume adjusting mechanism for adjusting the air volume in a duct and having a noise reduction function.

[0002]

2. Description of the Related Art In a conventional damper with a duct air volume adjusting mechanism, a damper plate is rotatably provided in a duct, and the air volume is adjusted by rotating the damper plate to adjust an air path area. .

[0003]

However, in the conventional damper, when the damper plate is rotated in a direction perpendicular to the wind direction to reduce the area of the wind path, immediately before passing through the wind path. Since the air flow collides with the damper plate and passes in a disturbed state, there is a disadvantage that a wind noise is generated.

It is conceivable to separately provide a silencer for reducing the wind noise. However, if the silencer is provided, it is not possible to adjust the opening degree from fully open to fully closed, and a large deflection is caused in the flow of wind. It is not a fundamental solution because it occurs. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a damper with a duct air volume adjusting mechanism capable of adjusting an air volume without generating wind noise.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a damper having a duct air volume adjusting mechanism for adjusting an air path area of a duct to adjust an air volume. Curved along the direction, a thin plate elastic plate for adjusting the wind path area by changing the curved shape, an urging means for urging the thin plate elastic plate in one direction, and being connected to the thin plate elastic plate, Adjusting means for adjusting the area of the wind path by elastically deforming the thin elastic plate against the urging force of the urging means.

According to the present invention, as the thin plate elastic plate is elastically deformed by the adjusting means to reduce the area of the air passage, the thin plate elastic plate is elastically deformed, and thus the upstream of the air passage reduced by the thin plate elastic plate. The side peripheral surface becomes curved. Accordingly, the air current smoothly passes through the wind path along the curved surface, so that no wind noise is generated.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a damper having a duct air volume adjusting mechanism according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view showing a first embodiment of a damper according to the present invention. As shown in the drawing, the damper 10 is provided at a predetermined position of a duct 12 through which an air flow passes in the direction of the arrow in the figure, and the ducts 12, 1 on both sides are provided via flanges 14, 14 provided at both ends thereof.
2 are connected.

FIG. 2 is a sectional view of the damper 10 of FIG. 1 taken along the line AA, and FIG. 3 is a sectional view of the damper 10 of FIG.
It is sectional drawing along the line. As shown in these figures, the damper 10 mainly includes a pair of ultra-thin stainless steel sheets 34 and 36 and a stainless steel sheet 3 which are thin elastic plates.
Adjusting unit 1 that adjusts the wind path area by elastically deforming 4, 36
6 and so on. In this embodiment, a stainless steel sheet is used as the thin elastic plate. However, the present invention is not limited to this, and a rubber sheet may be used.

The stainless sheet 34 is used for the damper case 1.
7, the upstream edge is fixed to the upper edge of the frame 42, and the downstream edge is fixed to the upper edge of the frame 44. The stainless steel sheet 36 is disposed on the lower surface side of the damper case 17, the upstream edge is fixed to the lower edge of the frame 42, and the downstream edge is fixed to the lower edge of the frame 44. The frame 42 is urged upstream by a plurality of springs 46 attached to the damper case 17, and the frame 44 is provided with a plurality of springs 47 attached to the damper case 17.
Are biased downstream.

Therefore, the stainless steel sheets 34, 36
Are urged in directions away from each other by urging forces of springs 46 and 47 transmitted through the frames 42 and 44. The stainless steel sheets 34 and 36 shown in FIG.
Shows a state where the air duct area between the stainless steel sheets 34 and 36 is reduced by elastically deforming by the adjustment unit 16 described later. Also, frames 42, 44
The opening is formed larger than the diameter of the duct 12 so that the airflow passing through the duct 12 does not collide.

A sound absorbing material 3 is provided on the lower surface of the stainless steel sheet 34.
8 is affixed, and a sound absorbing material 40 is affixed on the upper surface of the stainless steel sheet 36. The sound absorbing members 38 and 40 are made of glass wool and glass cloth, and mute noise in the duct 12. FIG. 4 is an explanatory diagram showing the configuration of the sound absorbing members 38 and 40. According to the drawing, the heads of the plurality of tacks 52, 52 are spot-welded to the stainless steel sheets 34, 36, and the tacks 5 are formed.
Glass wool 54 is inserted into 2, 52 ... and
A glass cloth 56 is inserted from above. The disc-shaped stoppers 58 are fixed to the tips of the studs 52 projecting from the glass cloth 56.

The adjusting section 16 comprises a screw rod 22, a handle 24, and a pair of metal fittings 30,32. The screw rod 22 is disposed vertically through the damper case 17 and at the center thereof, and has an upper end and a lower end which are the bearing 2.
It is rotatably supported by 6, 28. Screw rod 2
A handle 24 is fixed to the upper end of 2. Also,
A right-hand thread 31 is formed in the upper half of the threaded rod 22, and a left-hand thread 33 is formed in the lower half. A metal fitting 30 is screwed into the right screw 31, and the metal fitting 30 is made of a stainless steel sheet 3.
4 is fixed to the upper surface. A metal fitting 32 is screwed into the left screw 33, and the metal fitting 32 is made of a stainless steel sheet 36.
Is fixed to the lower surface of the.

Therefore, when the screw rod 22 is rotated in one direction by the handle 24, the stainless steel sheets 34, 3
6 are elastically deformed in a direction approaching and moving away from each other, and the area of the wind path can be adjusted. Further, sound absorbing materials 50, 50 are adhered to the inner walls on both the left and right sides of the damper case 17. FIG. 5 is a diagram showing a configuration of the sound absorbing material 50. The sound absorbing material 50 shown in FIG.
A glass wool 54 is adhered to 36, a glass cloth 56 is adhered thereon, and a punching sheet 51 is coated thereon.

Next, the operation of the thus configured volume damper will be described. First, when increasing the air path area of the volume damper 10, the handle 24 is rotated in the direction A in FIG. When the screw rod 22 rotates, the metal fitting 30 rises along the right-hand thread 31, so that the stainless sheet 34 is elastically returned to the original flat shape. Then, since the metal fitting 32 descends along the left screw 33, the stainless sheet 36 is also elastically returned to the original flat shape. As a result, since the stainless steel sheets 34 and 36 move away from each other, the area of the air passage increases.

Next, to reduce the area of the air passage, the handle 24 is rotated in the direction B in FIG. When the screw rod 22 rotates, the metal fitting 30 is turned to the right-hand thread 31.
2, the stainless sheet 34 is elastically deformed into a streamlined shape as shown in FIG. And fitting 3
2 rises along the left-hand thread 33, so that the stainless sheet 36 is also elastically deformed into a streamlined shape. Thereby, since the stainless steel sheets 34 and 36 approach each other, the area of the air passage is reduced.

With the air passage area reduced, the airflow flowing through the duct 12 is reduced by the stainless steel sheets 34 and 36.
Along the curved surface deformed into the streamline shape of the above, and passes through the reduced airway opening. Therefore, the air current smoothly passes through the wind path opening without being disturbed, and no wind noise is generated. FIG. 6 is a cross-sectional view showing a second embodiment of the damper. Members that are the same as or similar to those of the first embodiment shown in FIG. . Volume damper 60 shown in FIG.
Is obtained by elastically deforming one stainless sheet 34 into a streamline shape to adjust the area of the air passage. Reference numeral 62 denotes a threaded rod, and a thread in one direction is threaded on the threaded rod. Also in the present embodiment, when the stainless sheet 34 is elastically deformed to reduce the area of the air passage, the airflow passes through the air passage opening along the curved surface of the stainless sheet 34, and thus is the same as in the first embodiment. Effects can be obtained.

[0017]

As described above, according to the damper with the duct air volume adjusting mechanism of the present invention, even when the pair of thin elastic plates are elastically deformed to reduce the area of the air passage, the airflow is reduced by the thin elastic plates. Since the wind smoothly passes along the curved surface, no wind noise is generated.

[Brief description of the drawings]

FIG. 1 is a perspective view of a damper according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the damper of FIG. 1 taken along line AA.

FIG. 3 is a cross-sectional view of the damper of FIG. 1 taken along line BB.

FIG. 4 is an explanatory view showing the configuration of the sound absorbing material on the stainless steel sheet side.

FIG. 5 is an explanatory diagram showing a configuration of a sound absorbing material fixed to a damper case.

FIG. 6 is a sectional view showing a second embodiment of the damper.

[Explanation of symbols]

 10, 60: Damper 12: Duct 16: Adjustment unit 17: Damper case 22, 62: Screw rod 34, 36 ... Stainless steel sheet 38, 40, 50 ... Sound absorbing material 42, 44 ... Frame 46, 47 ... Spring

Claims (3)

[Claims] 1. A damper having an air volume adjusting mechanism for a duct for adjusting an air volume by adjusting an area of an air channel of the duct, wherein the air channel is curved in the duct along a wind direction, and the curved shape is changed. A thin plate elastic plate for adjusting the area; a biasing means for biasing the thin plate elastic plate in one direction; and an elastic deformation of the thin plate elastic plate connected to the thin plate elastic plate against the biasing means biasing force. Adjusting means for adjusting the air passage area by adjusting the air flow path area. 2. The adjusting means comprises: a threaded rod penetrating through the pair of thin elastic plates and having a right-handed thread and a left-handed thread formed in an axial direction thereof; And a first nut member fixed to the thin elastic plate; a second nut member screwed to a left-hand thread portion of the screw rod and fixed to the thin elastic plate; and connected to the screw rod. 2. A damper with a duct air volume adjusting mechanism according to claim 1, further comprising: a handle disposed outside the duct to rotate the screw bar. 3. A damper with a duct air volume adjusting mechanism according to claim 1, wherein a sound absorbing material is adhered to said thin elastic plate.